TY - GEN
T1 - Structure and reactivity of bimetallic Ni-Au catalysts for syngas production and utilization
AU - Chin, Ya Huei
AU - King, David L.
AU - Wang, Yong
AU - Roh, Hyun Seog
PY - 2006
Y1 - 2006
N2 - A key issue regarding the use of Ni catalysts for hydrocarbon steam reforming is their stability against carbon deposition. This deposition can be retarded by addition of promoter atoms such as Au that are thought to reside at the coordinatively unsaturated step and kinks sites. We have characterized the structure of Au-promoted Ni catalysts and investigated their reactivity toward syngas production and consumption. XPS and chemisorption results suggest the formation of a surface Au-Ni alloy. Methane steam reforming shows an effect of Au surface alloying through a modest reduction in initial activity and deactivation rate. However, CO DRIFT and methanation studies show little effect of Au addition. These latter results are consistent with surface reconstruction in the presence of CO, which minimizes the impact of Au. This study points out the contrast in findings from different characterization methods, and emphasizes the importance of characterizing bimetallic catalysts under actual working conditions.
AB - A key issue regarding the use of Ni catalysts for hydrocarbon steam reforming is their stability against carbon deposition. This deposition can be retarded by addition of promoter atoms such as Au that are thought to reside at the coordinatively unsaturated step and kinks sites. We have characterized the structure of Au-promoted Ni catalysts and investigated their reactivity toward syngas production and consumption. XPS and chemisorption results suggest the formation of a surface Au-Ni alloy. Methane steam reforming shows an effect of Au surface alloying through a modest reduction in initial activity and deactivation rate. However, CO DRIFT and methanation studies show little effect of Au addition. These latter results are consistent with surface reconstruction in the presence of CO, which minimizes the impact of Au. This study points out the contrast in findings from different characterization methods, and emphasizes the importance of characterizing bimetallic catalysts under actual working conditions.
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M3 - Conference contribution
AN - SCOPUS:34047250508
SN - 0841274266
SN - 9780841274266
T3 - ACS National Meeting Book of Abstracts
BT - Abstracts of Papers - 232nd American Chemical Society Meeting and Exposition
T2 - 232nd American Chemical Society Meeting and Exposition
Y2 - 10 September 2006 through 14 September 2006
ER -